Why an ac magnetic field shifts the irreversibility line in type-II superconductors

Details Why an ac magnetic field shifts the irreversibility line in type-II superconductors Why an ac magnetic field shifts the irreversibility line in type-II superconductors

2002-04-14

arxiv.org/abs/cond-mat/0204310v1

Physics

Condensed Matter

Superconductivity

4 pages including 4 figures

Scientific paper

10.1103/PhysRevLett.89.027002

We show that for a thin superconducting strip placed in a transverse dc magnetic field - the typical geometry of experiments with high-Tc superconductors - the application of a weak ac magnetic field perpendicular to the dc field generates a dc voltage in the strip. This voltage leads to the decay of the critical currents circulating in the strip, and eventually the equilibrium state of the superconductor is established. This relaxation is not due to thermally activated flux creep but to the "walking" motion of vortices in the two-dimensional critical state of the strip with in-plane ac field. Our theory explains the shaking effect that was used for detecting phase transitions of the vortex lattice in superconductors with pinning. Some recent experiments on this subject are discussed.

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